Composition of stacked bed for VGO hydrocracking with maximum diesel yield

NiMo/USY-Alumina Catalysts with Different Zeolite Content for Vacuum Gas Oil Hydrocracking Over Stacked Beds

“…It is confirmed by the decrease of the volume of these pores after supporting of Ni and Mo. As it was observed previously [6], the catalyst preparation were tested in VGO hydrocracking. Weight yields of each fraction and sulfur content in the middle distillates are given in Table 3.…”

“…Catalysts were sulfided in situ at a pressure of 3.5 MPa using the mixture of straight-run gas oil, dimethyl disulfide and aniline. The catalyst loading and sulfidation procedures are thoroughly described in [6]. Hydrocracking tests were carried out at a pressure of 16.0 MPa, a liquid hourly space velocity (LHSV) of 0.71 h −1 and H 2 to oil ratio of 1500 (v/v).…”

“…Sulfur content in middle distillates was measured by ultraviolet fluorescence on Xplorer-NS, TE Instruments. The conversion and selectivity to middle distillates were calculated as in [6]. The results of catalyst testing are reported from the average of several gas and liquid product samples taken from 144 to 192 h on stream.…”

“…When a catalyst based on ASA is used separately for VGO hydrocracking, higher yield of middle distillates is achieved. However, stacked beds become more popular due to higher activity and stability and improved quality of desired products-middle distillates, particularly higher cetane number for the diesel fuels and higher smoke point for the kerosene [6,17]. In this work, we study the influence of USY zeolite content on the properties of hydrocracking catalyst and the activity and selectivity of stacked bed in vacuum gas oil hydrocracking to achieve the maximal yield of middle distillates.…”

Influence of steam-calcination and acid leaching treatment on the VGO hydrocracking performance of faujasite zeolite

“…Tuning the acidity of Y zeolite, therefore, remains a major topic in the design of active hydrocracking catalysts for middle distillates production. The approach is to use moderately dealuminated zeolites and optimize their acid and textural properties to obtain satisfactory conversion levels and middle distillates yield [16].…”